CN111725728B - Gas insulated switchgear and cartridge assembly - Google Patents
Gas insulated switchgear and cartridge assembly Download PDFInfo
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- CN111725728B CN111725728B CN202010427077.2A CN202010427077A CN111725728B CN 111725728 B CN111725728 B CN 111725728B CN 202010427077 A CN202010427077 A CN 202010427077A CN 111725728 B CN111725728 B CN 111725728B
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- 238000007789 sealing Methods 0.000 claims abstract description 61
- 238000009413 insulation Methods 0.000 claims abstract description 43
- 229910052751 metal Inorganic materials 0.000 claims description 66
- 239000002184 metal Substances 0.000 claims description 66
- 230000013011 mating Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 241000208199 Buxus sempervirens Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0358—Connections to in or out conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/045—Details of casing, e.g. gas tightness
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Installation Of Bus-Bars (AREA)
Abstract
The invention relates to a gas insulation switch device and a barrel assembly, wherein the gas insulation barrel assembly comprises a closed air chamber formed by at least two barrels, a conducting rod arranged in the closed air chamber, an insulation support plate fixed on the barrels for supporting the conducting rod, barrel flanges connected with adjacent barrels are arranged on the barrels, the connected barrel flanges are in sealing fit, the barrel flange of at least one barrel is provided with a sealing fit part in sealing fit with the barrel flange of the adjacent barrel and a support plate connecting part connected with the insulation support plate, the sealing fit part and the support plate connecting part are arranged along the radial direction of the barrel, and the sealing fit part is arranged at the outer side of the support plate connecting part. Compared with the sealing of two sealing surfaces between two cylinder flanges and an insulating support plate, the sealing structure has the advantages that one sealing surface is reduced, and the air leakage risk of an air chamber is reduced.
Description
Technical Field
The invention relates to a gas insulated switchgear and a cylinder assembly.
Background
With the development of electric power industry and the acceleration of power grid construction pace in China, SF6Gas insulated metal enclosed gas insulated switchgear (hereinafter referred to as GIS) is also widely used. The insulating support plate is used as a key component of GIS equipment, has great influence on long-term electrification performance of products, and according to statistics, power failure accidents caused by insulating parts account for about 40%. The insulating support plate generally comprises a central insert, a metal flange, an insulating plate for connecting the central insert and the metal flange and the like, and mainly plays important roles of air chamber distinguishing, conductor supporting, main insulation resistance, normal and short-circuit current resistance and the like in the GIS. The insulating support plates are divided according to functions and mainly divided into a ventilation type insulating support plate and an unvented type insulating support plate, and the unvented type insulating support plate has the function of dividing adjacent air chambers; the insulation support plates are divided according to shapes, and conventionally comprise a basin-type insulation support plate and a plate-type insulation support plate, and the basin-type insulation support plate is generally used for GIS products with voltage levels of 252kV and above due to large creepage distance; according to the structural division, the insulating support plates have metal flanges and do not have metal flanges, and the insulating support plates with metal flanges can ensure adjacent cylindersThe reliable electric conduction of body shell is convenient for engineering ground connection design.
In the existing GIS equipment, the conducting rods are all filled with SF6In the gaseous barrel, through the electrically conductive connection of the center inserts of insulating backup pad and support between the adjacent conducting rod, for the convenience fixed between insulating backup pad, the barrel is equipped with the barrel flange, is equipped with the backup pad flange with the butt joint of barrel flange in the insulating backup pad. When conducting connection and fixing of conducting rods are carried out, the central insert of the insulating support plate is respectively in conducting connection with the two conducting rods, then the support plate flange of the insulating support plate is fixed between the two barrel flanges, and in order to guarantee the safety of a power grid, the sealing performance of the butt joint of the barrel flanges and the support plate flanges is guaranteed. And the insulation board of insulating backup pad has long-term electrified ageing phenomenon, can lead to insulating backup pad along the face flashover, sealed face gas leakage scheduling problem finally, brings the risk for the safety in production and the operation of electric wire netting.
Disclosure of Invention
The invention aims to provide gas insulation switch equipment to solve the problem that the sealing surface of an insulation support plate is easy to leak gas in the prior art, so that the running risk of a power grid is high; it is also an object of the present invention to provide a gas-insulated cylinder assembly that solves the above mentioned problems.
The technical scheme of the gas insulation cylinder assembly of the invention is as follows:
the gas insulation barrel assembly comprises a closed air chamber formed by enclosing at least two barrels and a conducting rod arranged in the closed air chamber, the gas insulation barrel assembly further comprises an insulation supporting plate fixed on the barrel to support the conducting rod, barrel flanges connected with adjacent barrels are arranged on the barrel and are in sealing fit, the barrel flanges of at least one barrel are provided with sealing fit portions in sealing fit with the barrel flanges of the adjacent barrels and supporting plate connecting portions connected with the insulation supporting plate, the sealing fit portions and the supporting plate connecting portions are arranged along the radial direction of the barrel, and the sealing fit portions are arranged on the outer sides of the supporting plate connecting portions.
The invention has the beneficial effects that: the adjacent barrel flanges are connected through the sealing matching parts and are in sealing matching, the insulating support plate is fixed on the inner side of the sealing matching parts through the support plate connecting parts, when the insulating support plate and the barrel are fixed, the insulating support plate is fixed on the support plate connecting parts of the barrel flanges, and then the two barrel flanges are fixed in sealing matching. The sealing performance of the air chamber can be ensured only by ensuring the sealing performance of the joint of the two cylinder body flanges, and the joint of the insulating support plate and the cylinder body flange does not need to be sealed. Compared with the prior art, a sealing surface is reduced, and the air leakage risk of the air chamber is reduced. In addition, the sealing relation does not exist between the insulating support plate and the cylinder flange, and the requirement on the machining precision of the connecting surface of the insulating support plate and the cylinder flange can be relatively reduced. The problem of among the prior art insulating supporting plate's sealed face leak gas easily, cause the electric wire netting operation risk high is solved.
For the fixed connection of convenient insulating backup pad and backup pad connecting portion, adjacent barrel flange encloses into the holding tank that holds insulating backup pad in this scheme, is equipped with on at least one in the adjacent barrel flange and encloses into the breach of holding tank, insulating backup pad is fixed on the lateral wall of holding tank, constitutes with the lateral wall of the holding tank that insulating backup pad is fixed backup pad connecting portion. Set up the breach on the barrel flange, need not increase other fixed knot who is used for fixed insulation support plate to construct on barrel or barrel flange, the processing of barrel is convenient.
For the convenience of fixing the insulating support plate and the barrel flange, the notch is arranged on the barrel flange connected with the insulating support plate in the scheme. Insulating backup pad is connected in breach department, conveniently fixes a position and fix insulating backup pad.
In order to increase the stability of the electrical connection between the insulating support plate and the barrel flange, the insulating support plate comprises an insulating plate and a metal connecting plate connected with the insulating plate, and the insulating support plate is connected with the support plate connecting part through the metal connecting plate. The insulation board is fixed on the metal connecting plate, and the metal connecting plate is fixedly connected with the barrel flange, so that the stable electrical connection between the insulation supporting plate and the barrel is realized.
Considering the structural strength of the joint of the insulating support plate and the barrel flange, the insulating plate is detachably connected with the metal connecting plate in the scheme. The metal connecting plate and the insulating plate are arranged in a split mode, so that the stability of the joint of the insulating plate and the metal connecting plate can be effectively guaranteed, and the structural strength of the joint is improved.
In order to facilitate the connection of the metal connecting plate with the insulating plate and the supporting plate connecting part, in the scheme, the supporting plate connecting part matching surface connected with the supporting plate connecting part and the insulating plate matching surface connected with the insulating plate on the metal connecting plate are positioned on the same side of the metal connecting plate. Therefore, an installer can connect the metal connecting plate with the cylinder flange and the insulating plate with the cylinder flange at the same side of the metal connecting plate, and the connection is convenient.
In order to prevent the point discharge phenomenon at the joint of the metal connecting plate and the insulating plate and the flange of the cylinder body, the metal connecting plate is provided with an insulating plate connecting hole for a threaded fastener for fixedly connecting the metal connecting plate and the insulating plate to pass through and a flange connecting hole for a threaded fastener for fixedly connecting the metal connecting plate and the flange of the cylinder body to pass through, and at least one of the insulating plate connecting hole and the flange connecting hole is of a counter bore structure. The counter bore structure can avoid the threaded fastener to leak outward, avoids the point discharge phenomenon, guarantees the electrical property of barrel subassembly.
For save material, in this scheme the conducting rod passes through insulating backup pad hoist and mount in sealed air chamber, and insulating backup pad only needs to set up to massive structure like this, need not process into annular structure, has reduced the material of insulating backup pad, and has reduced the face of being connected of barrel flange and insulating backup pad, has correspondingly reduced connection structure quantity.
For the structural strength who guarantees insulating backup pad, in this scheme insulating backup pad is fan-shaped along barrel axial direction's projection to the barrel intercommunication of messenger insulating backup pad both sides, the structural strength of insulating backup pad can effectively be guaranteed to the shape of insulating backup pad, guarantees the stable support of insulating backup pad to the conducting rod.
The technical scheme of the gas insulated switchgear of the invention is as follows:
the gas insulated switchgear comprises a switch main body and a barrel assembly, wherein the barrel assembly comprises a closed air chamber formed by enclosing at least two barrels and a conducting rod arranged in the closed air chamber, the barrel assembly further comprises an insulated support plate fixed on the barrel to support the conducting rod, a barrel flange connected with adjacent barrels is arranged on the barrel, the connected barrel flanges are in sealed fit, the barrel flange of at least one barrel is provided with a sealed fit part in sealed fit with the barrel flange of the adjacent barrel and a support plate connecting part connected with the insulated support plate, and the sealed fit part is arranged on the outer side of the support plate connecting part.
The invention has the beneficial effects that: the adjacent barrel flanges are connected through the sealing matching parts and are in sealing matching, the insulating support plate is fixed on the inner side of the sealing matching parts through the support plate connecting parts, when the insulating support plate and the barrel are fixed, the insulating support plate is fixed on the support plate connecting parts of the barrel flanges, and then the two barrel flanges are fixed in sealing matching. The sealing performance of the air chamber can be ensured only by ensuring the sealing performance of the joint of the two cylinder body flanges, and the joint of the insulating support plate and the cylinder body flange does not need to be sealed. Compared with the prior art, one sealing surface is reduced, and the air leakage risk of the air chamber is reduced. In addition, the sealing relation does not exist between the insulating support plate and the cylinder flange, and the requirement on the machining precision of the connecting surface of the insulating support plate and the cylinder flange can be relatively reduced. The problem of among the prior art insulating supporting plate's sealed face leak gas easily, cause the electric wire netting operation risk high is solved.
For the fixed connection of convenient insulating backup pad and backup pad connecting portion, adjacent barrel flange encloses into the holding tank that holds insulating backup pad in this scheme, is equipped with on at least one in the adjacent barrel flange and encloses into the breach of holding tank, insulating backup pad is fixed on the lateral wall of holding tank, constitutes with the lateral wall of the holding tank that insulating backup pad is fixed backup pad connecting portion. The notch is formed in the barrel flange, other fixing structures for fixing the insulating support plate do not need to be additionally arranged on the barrel or the barrel flange, and the barrel is convenient to process.
For the convenience of fixing the insulating support plate and the barrel flange, the notch is arranged on the barrel flange connected with the insulating support plate in the scheme. Insulating backup pad is connected in breach department, conveniently fixes a position and fix insulating backup pad.
In order to increase the stability of the electrical connection between the insulating support plate and the barrel flange, the insulating support plate comprises an insulating plate and a metal connecting plate connected with the insulating plate, and the insulating support plate is connected with the support plate connecting part through the metal connecting plate. The insulation board is fixed on the metal connecting plate, and the metal connecting plate is fixedly connected with the barrel flange, so that the insulation supporting plate is stably and electrically connected with the barrel.
Considering the structural strength of the joint of the insulating support plate and the barrel flange, the insulating plate and the metal connecting plate can be detachably connected in the scheme. The metal connecting plate and the insulating plate are arranged in a split mode, so that the stability of the joint of the insulating plate and the metal connecting plate can be effectively guaranteed, and the structural strength of the joint is improved.
In order to facilitate the connection of the metal connecting plate with the insulating plate and the supporting plate connecting part, in the scheme, the supporting plate connecting part matching surface connected with the supporting plate connecting part and the insulating plate matching surface connected with the insulating plate on the metal connecting plate are positioned on the same side of the metal connecting plate. Therefore, an installer can connect the metal connecting plate with the cylinder flange and the insulating plate with the cylinder flange at the same side of the metal connecting plate, and the connection is convenient.
In order to prevent the point discharge phenomenon at the joint of the metal connecting plate and the insulating plate and the flange of the cylinder body, the metal connecting plate is provided with an insulating plate connecting hole for a threaded fastener for fixedly connecting the metal connecting plate and the insulating plate to pass through and a flange connecting hole for a threaded fastener for fixedly connecting the metal connecting plate and the flange of the cylinder body to pass through, and at least one of the insulating plate connecting hole and the flange connecting hole is of a counter bore structure. The counter bore structure can avoid the threaded fastener to leak outward, avoids the point discharge phenomenon, guarantees the electric property of barrel subassembly.
For save material, in this scheme the conducting rod passes through insulating backup pad hoist and mount in sealed air chamber, and insulating backup pad only needs to set up to massive structure like this, need not process into annular structure, has reduced the material of insulating backup pad, and has reduced the face of being connected of barrel flange and insulating backup pad, has correspondingly reduced connection structure quantity.
For the structural strength who guarantees insulating backup pad, in this scheme insulating backup pad is fan-shaped along barrel axial direction's projection to the barrel intercommunication of messenger insulating backup pad both sides, the structural strength of insulating backup pad can effectively be guaranteed to the shape of insulating backup pad, guarantees the stable support of insulating backup pad to the conducting rod.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a gas-insulated cartridge assembly of the present invention;
FIG. 2 is a view taken along line A of FIG. 1;
FIG. 3 is an enlarged view of a portion of FIG. 1 at B;
FIG. 4 is a schematic view of the structure of the insulating plate of FIG. 1;
FIG. 5 is a cross-sectional view of the left side view of FIG. 4;
FIG. 6 is a schematic structural view of the metal connecting plate in FIG. 1;
fig. 7 is a cross-sectional view of the left side view of fig. 6.
In the figure: 1-a first cylinder body, 2-a second cylinder body, 3-a cylinder body connecting bolt, 4-L-shaped gap, 5-an insulating support plate, 6-a first contact finger seat, 7-a second contact finger seat, 8-a first conducting rod, 9-a second conducting rod, 10-a metal connecting plate, 11-a sealing ring, 12-an insulating plate connecting bolt, 13-a flange connecting bolt, 14-a first cylinder body flange, 21-a second cylinder body flange, 51-a central insert, 52-an embedded nut, 53-an insulating plate, 101-an insulating plate connecting hole, 102-a flange connecting hole and 103-a sealing groove.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
In the embodiment of the gas insulation cylinder assembly of the present invention, as shown in fig. 1, the gas insulation cylinder assembly includes a closed air chamber surrounded by a first cylinder 1 and a second cylinder 2, and a first conductive rod 8 and a second conductive rod 9 are respectively disposed in the first cylinder 1 and the second cylinder 2. The gas insulation cylinder assembly further includes an insulation support plate 5 fixed on the cylinder to support the two conductive rods, as shown in fig. 4 and 5, the insulation support plate 5 includes an insulation plate 53 and a center insert 51 embedded on the insulation plate 53, and the first conductive rod 8 and the second conductive rod 9 are conductively connected through the center insert 51. The first barrel 1 is provided with a first barrel flange 14 connected with the second barrel 2, and the second barrel 2 is correspondingly provided with a second barrel flange 21 connected with the first barrel flange 14. First barrel flange 14 has sealed cooperation portion and sets up the support connection portion in sealed cooperation portion inboard, and insulating backup pad 5 is connected on the support connection portion of first barrel flange 14, and second barrel flange 21 passes through barrel connecting bolt 3 with the sealed cooperation portion of first barrel flange 14 to be connected and sealed cooperation to guarantee the leakproofness of closed gas chamber. When the insulating support plate and the cylinder are fixed, the insulating support plate is fixed on the support plate connecting part of the cylinder flange, and then the two cylinder flanges are matched and fixed in a sealing mode. The sealing performance of the air chamber can be ensured only by ensuring the sealing performance of the joint of the two cylinder body flanges, and the joint of the insulating support plate and the cylinder body flange does not need to be sealed. Compared with the prior art, a sealing surface is reduced, and the air leakage risk of the air chamber is reduced. In addition, the sealing relation does not exist between the insulating support plate and the cylinder flange, and the requirement on the machining precision of the connecting surface of the insulating support plate and the cylinder flange can be relatively reduced. The air leakage risk of the sealing surface of the insulating support plate in the prior art is remarkably reduced, and the problem that the operation risk of a power grid is high due to the fact that air leakage of the sealing surface of the insulating support plate in the prior art is easy is solved.
As shown in fig. 1, in order to facilitate the conductive connection between the two conductive rods and the insulating support plate 5, in this embodiment, a first contact finger seat 6 is conductively connected between the first conductive rod 8 and the central insert 51, and a spring contact finger is disposed between the first contact finger seat 6 and the first conductive rod 8; a second contact finger seat 7 is conductively connected between the second conductive rod 9 and the central insert 51, and a spring contact finger is arranged between the second contact finger seat 7 and the second conductive rod 9. Specifically, the central insert 51 and the first contact finger seat 6, and the central insert 51 and the second contact finger seat 7 are fixed by threaded fasteners, respectively, so as to realize the conductive connection between the central insert 51 and the first contact finger seat and the second contact finger seat 7; the first conducting rod 8 is in conductive connection with the first contact finger seat 6 and the second conducting rod 9 is in conductive connection with the second contact finger seat 7 through corresponding springs, so that the first conducting rod 8 is in conductive connection with the second conducting rod 9. The threaded fastener may be a screw or a bolt.
In other embodiments, the conductive rod may be directly conductively connected to the central insert. In the embodiment, the contact surface of the contact finger seat and the conductive rod is treated by a silver plating process, so that the contact resistance between the central insert and the contact finger seat is reduced, and long-term current can be borne without serious heating; the contact finger seat and the conducting rod need to be plated with silver to meet the through-current requirement; meanwhile, for convenience of assembly, the spring contact fingers can be replaced by flow guide elements such as plum blossom contact fingers and the like; in addition, the ends of the conductive rods should be smoothly transitioned to prevent them from causing point discharge to the insulating support plate 5.
As shown in fig. 1 and 2, the support plate connection portion is a notch provided on the first cylinder flange 14, and the second cylinder flange 21 and the notch of the first cylinder flange 14 enclose a receiving groove for receiving the insulating support plate 5. In order to facilitate the connection between the insulating support plate 5 and the support plate connection portion, the notch in this embodiment is an L-shaped notch 4, and the insulating support plate 5 is fixed on a surface of the L-shaped notch 4 parallel to the radial direction of the first cylinder 1. Through set up L shape breach 4 on first barrel flange 14, avoided increasing other fixed knot who is used for fixed insulation support plate 5 on barrel or barrel flange to construct, made things convenient for the processing of barrel. In addition, the insulating support plate 5 is connected at the L-shaped notch 4, so that the insulating support plate 5 is conveniently positioned. In other embodiments, the notch on the first cylinder flange can also be an arc notch; notches which are enclosed into an accommodating groove can be arranged on the first cylinder flange and the second cylinder flange; a flange connecting plate which extends along the flange of the cylinder body and extends into the sealed air chamber can be arranged on the cylinder body, and the insulating supporting plate is connected to the flange connecting plate; the first cylinder flange and the second cylinder flange can be provided with no holding tank, and the insulating support plate is directly connected to the inner side wall of the first cylinder flange or the second cylinder flange; the insulating support plate can also be connected to the second cylinder flange which encloses the accommodating groove.
As shown in fig. 3, the insulating support plate in this embodiment further includes a metal connecting plate 10 detachably connected to the insulating plate 53, and the insulating support plate 5 is connected to the L-shaped notch 4 through the metal connecting plate 10. As shown in fig. 6 and 7, the metal connecting plate 10 is provided with an insulating plate connecting hole 101 and a flange connecting hole 102, the insulating plate 53 is fitted with the insert nut 52, and the L-shaped notch 4 is provided with a threaded hole. When the metal connecting plate 10 is connected to the insulating plate 53, the insulating plate connecting hole 101 is aligned with the embedded nut 52 and the insulating plate connecting bolt 12 is connected to the embedded nut 52; when the metal connecting plate 10 is connected to the first cylinder flange 14, the flange connecting holes 102 are aligned with the screw holes and the flange connecting bolts 13 are connected to the screw holes. The metal connecting plate 10 is fixedly connected with the first cylinder flange 14, so that the insulating support plate 5 can be stably and electrically connected with the first cylinder flange 14. The insulation board 53 and the metal connecting plate 10 are arranged in a split mode, so that the stability of the joint of the insulation board 53 and the metal connecting plate 10 can be effectively guaranteed, and the structural strength of the joint is improved. The metal connecting plate 10 and the insulating plate 53 are arranged in a split mode, so that a connecting structure which is directly connected with the flange connecting portion can be prevented from being machined on the insulating plate, and the structural strength of the connecting portion of the metal connecting plate 10 and the insulating plate 53 is guaranteed. In other embodiments, the notch is not provided with a threaded hole, and a fastening nut connected with the flange connecting bolt is fixed on the notch; the metal connecting plate can be embedded and fixed on the insulating plate; the insulating support plate can also be directly connected with the support plate connecting part of the cylinder flange through an insulating plate.
In order to facilitate the processing design of the insulating support plate 5, the insert nut 52, the central insert 51 and the insulating plate 53 in this embodiment are integrally molded. In addition, in order to facilitate the connection between the metal connecting plate 10 and the insulating plate 53 and the L-shaped notch 4, the embedded nut 52 and the threaded hole in the embodiment are both located on the same side of the metal connecting plate 10. Therefore, an installer can connect the metal connecting plate 10 with the first cylinder flange 14 and the insulating plate 53 with the first cylinder flange 14 on the same side of the metal connecting plate 10, and the connection is convenient. In other embodiments, the support plate connecting portion mating surface and the insulator plate mating surface may be on different sides of the metal connecting plate. As shown in fig. 6, in consideration of the possibility of a point discharge phenomenon at the connection between the metal connecting plate 10 and the insulating support plate 5 and the first cylinder flange 14, in this embodiment, both the insulating plate connecting hole 101 and the flange connecting hole 102 are of a counterbore structure. The counter bore structure can avoid the connecting bolt to leak outward, avoids the point discharge phenomenon. In other embodiments, the insulation plate connection hole and the flange connection hole may be a general through hole structure.
As shown in fig. 2, in order to save material, the projection of the insulating support plate 5 in the embodiment along the axial direction of the cylinder is fan-shaped, and the two conducting rods are hung in the sealed air chamber through the insulating support plate. Therefore, the insulating support plate 5 only needs to be arranged into a blocky structure and does not need to be processed into an annular structure, the material of the insulating support plate 5 is reduced, the connecting surface between the insulating support plate 5 and the L-shaped notch 4 is reduced, and the number of connecting structures is correspondingly reduced. The shape of the insulating support plate 5 has better structural strength, and the insulating support plate 5 is guaranteed to stably support the two conducting rods. In other embodiments, the projection of the insulating support plate in the axial direction of the cylinder body can also be in other shapes such as a rectangle or an ellipse; the insulating support plate can also be a ring-shaped insulating support plate in the prior art. In order to increase the sealing performance of the cylinder flange, a sealing groove 103 for installing a sealing element is provided on the sealing engagement portion of the first cylinder flange 14 in this embodiment, and a sealing ring 11 is provided in the sealing groove 103. In other embodiments, the sealing groove is not arranged, and the sealing groove is matched with the butt joint surface of the cylinder flange in a sealing way; sealing grease can be arranged on the sealing matching part of the cylinder flange for sealing.
The insulating support plate in the gas insulating cylinder assembly provided by the invention is different from the conventional ventilation type insulating support plate structure, and aims at solving the problems of high material cost, easy air leakage of an epoxy material sealing surface and the like. The structure can be flexibly applied to GIS gas insulated switchgear, realizes reliable insulation margin, mechanical anti-seismic performance, through-flow capacity, sealing performance and the like, can be popularized to three-phase common-box equipment to form a series of structurally similar products, and has important significance for reducing production cost and improving power grid safety. The structure can also be flexibly applied to a GIL bus power transmission system, and also realizes reliable insulation margin, mechanical anti-seismic performance, through-current capacity, sealing performance and the like.
In a specific embodiment of the gas insulated switchgear of the present invention, the gas insulated switchgear in this embodiment includes a switch main body and a cylinder assembly, and the cylinder assembly has the same structure as the gas insulated cylinder assembly described in the specific embodiment of the gas insulated cylinder assembly, and is not described again.
Claims (8)
1. The gas insulation barrel assembly comprises a closed air chamber formed by at least two barrels, a conducting rod arranged in the closed air chamber, an insulation support plate fixed on the barrel to support the conducting rod, and a barrel flange connected with an adjacent barrel, and is characterized in that the connected barrel flanges are in sealing fit, the barrel flange of at least one barrel is provided with a sealing fit part in sealing fit with the barrel flange of the adjacent barrel and a support plate connecting part connected with the insulation support plate, the sealing fit part and the support plate connecting part are arranged along the radial direction of the barrel, the sealing fit part is arranged outside the support plate connecting part, the insulation support plate comprises an insulation plate and a metal connecting plate connected with the insulation plate, the insulation support plate is connected with the support plate connecting part through the metal connecting plate, and the insulation plate is detachably connected with the metal connecting plate, the insulating plate is located between the conducting rod and the barrel along the radial direction of the barrel, the cross section of the insulating plate, which is coplanar with the axis of the conducting rod, is arc-shaped, and the plate surface of the metal connecting plate extends along the radial direction of the barrel.
2. A gas insulating cartridge assembly according to claim 1, wherein adjacent cartridge flanges define a receiving groove for receiving the insulating support plate, at least one of the adjacent cartridge flanges being provided with a notch defining said receiving groove, the insulating support plate being secured to a side wall of the receiving groove, the side wall of the receiving groove secured to the insulating support plate defining said support plate connection.
3. A gas-insulated cartridge assembly according to claim 2, characterized in that the cartridge flange connected to the insulating support plate is provided with said notch.
4. A gas-insulated cartridge assembly according to any of claims 1-3, wherein the mating surfaces of the support plate connection parts to which the support plate connection parts are connected and the mating surfaces of the insulating plate to which the insulating plate is connected on the metal connecting plate are on the same side of the metal connecting plate.
5. A gas-insulated cartridge assembly according to any one of claims 1-3, wherein the metal connecting plate is provided with an insulating plate connecting hole through which a threaded fastener for fixedly connecting the metal connecting plate to the insulating plate passes and a flange connecting hole through which a threaded fastener for fixedly connecting the metal connecting plate to the cartridge flange passes, at least one of the insulating plate connecting hole and the flange connecting hole being of a counter bored configuration.
6. A gas-insulated cartridge assembly according to any of claims 1-3, characterized in that the conducting rod is suspended in the sealed gas chamber by means of a support plate.
7. The gas-insulated cylinder assembly of claim 6, wherein the projection of the insulating support plate in the axial direction of the cylinder is fan-shaped to communicate the cylinders on both sides of the insulating support plate.
8. Gas-insulated switchgear comprising a switch body and a cartridge assembly, characterized in that the cartridge assembly is a gas-insulated cartridge assembly according to any of claims 1-7.
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| CN111725728B true CN111725728B (en) | 2022-06-14 |
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| CN118157017A (en) * | 2024-03-15 | 2024-06-07 | 广东明阳电气股份有限公司 | Gas tank structure of environment-friendly GIS switch equipment and environment-friendly GIS switch equipment |
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